低温风洞绝热结构设计与性能分析

绝热结构设计是建造大型低温风洞的关键环节之一。结合数值计算与试验，开展了绝热结构设计和性能分析研究。基于风洞运行条件，对绝热结构进行了设计和选材；建立了绝热结构有限元模型，基于风洞运行的最恶劣工况对绝热结构性能进行了数值计算分析，分析其绝热特性和应力分布规律。设计构建了可模拟低温风洞服役环境的试验舱平台，开展了低温交变压力冲击下的应力/应变和温度测量试验。研究结果表明:设计的绝热结构满足低温风洞运行要求，设计的试验舱平台适用于绝热结构性能考核，也为研究其他材料在低温环境下的热力学性能提供了一套可靠的试验平台。

Design and property analysis on insulation structure of cryogenic wind tunnel

The cryogenic wind tunnel is the best way to achieve flight Reynolds number testing in engineering application, with great strategy importance in the national defense field. The insulation structure has become one of the key technologies for building large cryogenic wind tunnels. On this account, design and property analysis on insulation structure is investigated with the help of numerical simulation and experiment. Firstly, considering the wind tunnel working condition, design and material selection for the insulation structure is carried out. Then, the finite element modeling of the insulation structure is built. On this basis, the property of the insulation structure is numerically studied based on the actual worst working condition of the wind tunnel. The insulation characteristics and stress/displacement distribution of the insulation structure are analyzed. Finally, the experimental platform able to simulate the working condition of cryogenic wind tunnel is designed and constructed to carry out the temperature and stress/strain measurement experiment for the insulation structure under cryogenic alternating pressure working condition. The obtained results show that the designed insulation structure satisfies the demands of the cryogenic wind tunnel in service, which solves the problem of insulation structure designation. Additionally, the designed experimental platform solves the problem of property evaluation of the insulation structure, which paves the way for building the cryogenic wind tunnel of our country in the future.